1. Developmental stages of human embryos;Jirásek;Czech Med,1978
2. A series of normal stages in the development of the chick embryo;Hamburger;J. Morphol.,1951
3. The House Mouse: Atlas of Embryonic Development;Theiler,1989
4. External development of the rabbit and rat embryo;Edwards;Adv. Teratol.,1968
5. Normal table of Xenopus laevis (Daudin),1956